16. What is the largest phylum of invertebrates?
a) Porifera
b) Mollusca
c) Arthropoda
d) Platyhelminthes
Answer: c) Arthropoda
17. What is the body plan of a jellyfish?
a) Bilateral symmetry
b) Radial symmetry
c) Asymmetrical
d) Spherical
Answer: b) Radial symmetry
18. How do insects respire?
a) Through gills
b) Through lungs
c) Through spiracles
d) Through their skin
Answer: c) Through spiracles
19. Which of the following is a type of arthropod?
a) Earthworm
b) Beetle
c) Starfish
d) Squid
Answer: b) Beetle
20. Which of the following is a characteristic of mollusks?
a) They have a segmented body
b) They have a hard exoskeleton
c) They have a radula
d) They have jointed appendages
Answer: c) They have a radula
